NR 812.40(4)(4) Hinged roof or removable hatch over the well or some provision for pulling the pump; and

NR 812.40(5)(5) The structure may not be used for storage of materials that could contaminate the well.

NR 812.41NR 812.41 Disinfection, flushing and sampling.

NR 812.41(1)(1) Disinfection. When a potable well is entered for the purpose of installing, replacing or repairing equipment located within the well, the well and discharge piping shall be thoroughly disinfected by the pump installer or by the person who installed the pump using sodium hypochlorite or calcium hypochlorite. Chlorine compounds having additives may not be used.

NR 812.41(1)(a)(a) The disinfectant shall be dispersed throughout the entire water column and in the water system.

NR 812.41(1)(b)(b) A chlorine solution with a minimum of 100 mg/l of chlorine shall be used to disinfect wells and water systems.

NR 812.41(1)(c)(c) The disinfectant solution shall be prepared according to Table D and shall remain in the system at least 8 hours, except for emergency situations when water is needed without delay. A contact time of at least 30 minutes shall be provided for emergency situations.

NR 812.41(2)(2) Flushing. The pump installer or his or her agent shall thoroughly flush the system of chlorine after disinfecting and before the pump is placed in normal service.

NR 812.41(3)(3) Water sample collection, analysis, and reporting. The pump installer shall collect water samples, submit them to a certified laboratory for analysis, and provide the test results in compliance with s. NR 812.46.

NR 812.41 HistoryHistory: Cr. Register, January, 1991, No. 421, eff. 2-1-91; am. (1) (intro.), (3) (a), (c), Register, September, 1994, No. 465, eff. 10-1-94; CR 13-099: r. and recr. (3), cr. (4) Register September 2014 No. 705, eff. 10-1-14; CR 18-095: am. (1) (c), r. and recr. (3), r. (4) Register June 2020 No. 774, eff. 7-1-20.

NR 812.42NR 812.42 Criteria for evaluation. Each existing water system shall be viewed as an individual unit and its acceptability for use as a source of water shall be determined on the basis of its location, construction, installation, pump discharge piping arrangement, water quality, and sanitary condition. The owner shall provide written documentation verifying the date of construction or installation or both. Existing installations shall meet all of the following requirements:

NR 812.42(1)(a)(a) Location. The well location shall comply with the requirements in effect at the time the well was constructed as shown in Table E, or to the location requirements of s. NR 812.08, whichever is less restrictive. However, if a contamination source was installed after the well was constructed, the well location shall conform to the requirements in effect at the time of installation of the contamination source.

NR 812.42(1)(b)1.1. The well construction shall comply with the construction requirements in effect at the time the well was constructed or shall be in compliance with any standards or approval issued under ss. NR 812.09 to 812.25, except if the well was constructed prior to April 10, 1953, in which case the well construction shall be in compliance with the standards adopted on April 10, 1953.

NR 812.42(1)(b)2.2. The well casing pipe shall meet the minimum wall thickness requirements of s. NR 812.11 Table B for its diameter and may not be in a deteriorated condition.

NR 812.42(1)(b)3.3. For wells in basements or walkout basements, the well casing pipe depth shall be measured from the floor of the basement.

NR 812.42(1)(b)4.4. Wells completed in unconsolidated formations, including both drilled and driven point wells, shall have minimum well casing pipe depth settings of at least 25 feet below the ground surface, not including the screen; or, if the static water level is deeper than 15 feet, shall have the minimum well casing pipe depth setting at least 10 feet below the static water level.

NR 812.42(1)(b)5.5. Wells completed in sandstone shall have minimum well casing pipe depth settings below the ground surface as follows:

NR 812.42(1)(b)6.6. Wells terminating in limestone or dolomite shall have minimum well casing pipe depth settings below the ground surface as follows:

NR 812.42(1)(b)6.b.b. Sixty feet when the depth to bedrock is less than 10 feet below the ground surface and the well was constructed between February 1, 1991 and July 1, 2020.

NR 812.42(1)(b)6.c.c. Sixty feet when the depth to bedrock is less than 20 feet below the ground surface and the well was constructed after July 1, 2020.

NR 812.42(1)(b)7.7. Wells terminating in bedrock other than sandstone, limestone, or dolomite shall have a minimum of 40 feet of casing pipe below the ground surface.